Feed water heater for boilers



sept. 15, 1936. H, A SCOTT 2,054,733

FEED WATER HEATER FOR BOILERS Filed July 18, 1935 3 sheets-sheet 1 hnl Nm W 1 \1\ N Q n I N w l N IN1/Enron Sept. 15, H. A vSGOTT 2,054,733

FEED WATER HEATER FOR BOILERS FledJuly 18, 1935 3 Sheets-Sheet 2 0 `n n0 0 l o W wir# y \A\N N ATTORNEY Sept. 15, 1936. H. A. SCOTT FEED WATERHEATER FOR BOILERS Filed July 18, 1955 lfaff'yxl,

kmh.

Patented Sept. 15, 1936 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to feed water heaters for boilers, and has forthe primary object the provision of a device of this character whichwill efliciently heat feed water for a boiler by employing waste heatand gases from the boiler'and which may be readily adapted to a. boilerand permit the boiler tubes to be easily cleaned and repaired and otherrepairs made which may be necessary to the interior of the boiler fromthe smoke box thereof and provides a device adaptable for boilersemployed in oil fields which require frequent cleaning and repairing dueto the fuel burnt therein.

With these and other objects in View, this invention consists in certainnovel features of construction, combination and arrangement of parts tobe her-einafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had tothe following description and acocmpanying drawings, in which- Figure 1is a transverse sectional view showing a boiler equipped with a feedWater heater constructed in accordance with this invention.

Figure 2 is a fragmentary vertical sectional view illustrating the sameand showing in dotted lines the heater positioned in an inoperativeposition.

Figure 3 is a fragmentary transverse sectional view drawn on an enlargedscale showing a mounting of the feed water heater in the smoke box of aboiler.

Figure 4 is a fragmentary side elevation showing the door of the smokebox in a closed position.

Referring in detail to the drawings, the numeral I indicates a steamboiler of a conventional construction and of a type principally employedin oil fields. The boiler has the usual boiler tubes 2, smoke box 3 andsmoke stack 4. The front of the smoke box may be opened by a hinged door5 to give access to the smoke box for the purpose of making interiorrepairs for the boiler.

The foregoing description briefly sets forth a boiler to which myinvention is adapted.

Substantially U-shaped hangers 6 are removably secured to the upper wallof the smoke box 3 and form journals for a feed water heater 1 which innormal operation is disposed vertically in the smoke box 3 and adjacentto the discharge end of the tubes 2 so that the waste heat and gases ofthe boiler will act on the feed water heater 1 prior to passing to thesmoke stack 4. The heater 1 has connected thereto horizontally arrangedpipes 8 and 9 journaled in the hangers 6 and extend through oppositewalls Qi the Smoke box and are connected to pipes II) and II by unionsI2. The pipe 9 provides the outlet for the heater and has directconnection with the boiler by a pipe I3 so that the water after passingfrom the heater may enter the boiler. A control valve I4 is arranged inthe pipe 9. The connection between the pipe 9 and the pipe I3 is by aT-coupling I5 to which the pipe Il is connected. The pipe I0 has acontrol valve I6 and the pipe II has a control valve I1. The pipe IU isconnected to a water supply pipe I8 by a T-coupling I9 and the latterhas the pipe II connected thereto.

The heater 1 includes an upper head 2D and a series of lower heads 2|,each of semispherical shape and each provided with a drain plug 22. Theupper head 20 is divided into chambers 23, 24, 25 and 26. Connected toeach lower head 2l are groups of pipes or tubes 21 and 28. The tubes 21of the lower righthand head 2| are connected to the chamber 23 of theupper head 20 and the tubes 28 are connected to the chamber 24. Thelower intermediate head has the tubes 21 thereof connected to thechamber 24 and the tubes 28 to the chamber 25. the tubes 21 thereofconnected to the chamber 25 and the tubes 28 connected to the chamber26. The chamber 23 is the inlet chamber and the chamber 26 is the outletchamber for the Water. The tubes 21 form down passages for the waterwhile the tubes 28 form up passages for the Water. It will thus be seenthat the water entering from the supply or the pipe I0 is caused totravel upwardly and downwardly several times in the heater beforepassing therefrom to the pipe 9 so that the temperature of the waterwill be gradually raised from the inlet end of the heater to the outletend of the heater by employing the waste heat and gases from the boiler.When it is desired to clean the boiler, the unions I2 are released andthe heater swung into a horizontal position, as shown in dotted lines inFigure 2, Where it is supported by a bar 28 carried by a bracket 25mounted on the boiler. The heater thus positioned will permit freeaccess to the interior of the smoke box and the boiler tubes 2 forcleaning and repair. The entire heater may be readily rem'oved from thesmoke box by detaching the pipes 8 and 9 therefrom.

Further, it is to be noted that the operation of the boiler can becontinued while the heater is in an inoperative position by closing thevalves I6 and I4 and opening the valve I1.

The employment of a series of lower heads to the heater will permit theheater to readily ex- The l-efthand lower head has pand and contract. Asthe water progresse-s from the inlet end of the heater to the outlet endthere will be a variance in the expansion and contraction of portions ofthe heater and the employment of the independent lower heads willreadily compensate for the variance in expansion and contractionthroughout the heater.

A bypass 3U connects the bottom of the boiler to the feed pipe Illbetween the Valve IE and the inlet pipe B and has located therein acheck valve 3|. The bypass also includes a pipe 32 which connects theboiler to the pipe Il and has a check valve 33 therein so that shouldthe water supply fail during the operation of the boiler, the heater mayhave water circulation with the boiler to prevent damage to the heaterfrom lack of water.

Having described the invention, I claim:

A heater for the purpose set forth, comprising an upper head, lowerheads and tubes connected to the upper head and lower heads, Water inletand outlet pipes connected respectively to the ends 0f the upper headand adjustable hangers supporting said pipes, said upper head havingpartitions dividing the same into a plurality of closed compartments andthe lower heads being substantially U-shaped in cross section and beingspaced from each other and the tubes connecting the'upper head and lowerheads being arranged in spaced series to permit the water from the inletpipe flowing continuously in opposite directions through the severalcompartments in the upper head and through the spaced lower heads beforefinding an outlet through the outlet pipe.

HARRY A. SCOTT.

